CN110932377B - Super farad capacitor charging and discharging control circuit and method and electronic equipment - Google Patents
Super farad capacitor charging and discharging control circuit and method and electronic equipment Download PDFInfo
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- CN110932377B CN110932377B CN201911340855.8A CN201911340855A CN110932377B CN 110932377 B CN110932377 B CN 110932377B CN 201911340855 A CN201911340855 A CN 201911340855A CN 110932377 B CN110932377 B CN 110932377B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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Abstract
The invention discloses a super farad capacitor charging and discharging control circuit, a method and electronic equipment, belonging to the field of electronic equipment, wherein the method comprises the following steps: closing the first switch, charging the super farad capacitor through the front end system, and supplying power to the back end system; collecting a voltage value of the super farad capacitor; when the voltage of the super farad capacitor rises to a first voltage threshold value, a second switch is closed, the first switch is disconnected, and power is supplied to the back-end system through the super farad capacitor; the control circuit of the super farad capacitor is formed by the logic gate circuit of the electronic comparator and used for switching a power supply path between the super capacitor and a main system power supply, so that the purpose of power supply isolation is achieved, the possibility of instantaneous high-current charging of the super farad capacitor is avoided, the system safety is improved, and the system endurance time is prolonged.
Description
Technical Field
The invention relates to the field of electronic equipment, in particular to a super farad capacitor charging and discharging control circuit and method and electronic equipment.
Background
In the current direct current low voltage system such as the car audio, the small mobile robot and other products, the super farad capacitor is often connected in parallel with the system power supply in the product using the super farad capacitor, in order to provide the instantaneous heavy current for the load, at this moment, the super farad capacitor is charged by the system power supply, and does not have the isolation function of the system power supply and the load power supply. And under the condition that the super capacitor does not have enough electric quantity, the system power supply can be pulled down due to the fact that the super capacitor is charged instantly when the system is powered on, and therefore system abnormity is caused. In a power system with a motor, the reverse electromotive force generated by the deceleration or sudden stop of the motor can directly act on a main system power supply, at the moment, the super farad capacitor cannot effectively store electric energy, and the reverse electromotive force can generate overvoltage impact on a main power supply battery, so that the service life of the main power supply battery is reduced.
Disclosure of Invention
The invention provides a super farad capacitor charge-discharge control circuit, a method and electronic equipment, wherein the control circuit of the super farad capacitor is formed by a logic gate circuit of an electronic comparator and is used for switching a power supply path between the super capacitor and a main system power supply, so that the purpose of power supply isolation is achieved, the possibility of instantaneous heavy current charging of the super farad capacitor is avoided, the system safety is improved, and the system endurance time is prolonged.
The technical scheme adopted by the invention for solving the technical problems is as follows:
according to one aspect of the invention, a super farad capacitor charging and discharging control circuit is provided, which comprises a first comparator, a second comparator, a first not gate, a second not gate, a first and gate and a second and gate, wherein an input end of the first comparator is used for respectively acquiring an input voltage of a front end system and an output voltage of a back end system, an output end of the first comparator is connected with an input end of the first not gate, and an output end of the first not gate is connected to one input end of the first and gate and one input end of the second and gate; the input end of the second comparator is used for respectively collecting the voltage of the super-farad capacitor and a second voltage threshold, the output end of the second comparator is connected to the input end of the second NOT gate and the other input end of the first AND gate, and the output end of the second NOT gate is connected to the other input end of the second AND gate.
Optionally, a first switch is disposed between the front-end system and the super farad capacitor, and a second switch is disposed between the back-end system and the super farad capacitor.
Optionally, the output end of the first comparator, the output end of the first and gate, and the output end of the second and gate are used for controlling the first switch and the second switch.
Optionally, the second voltage threshold is a difference between an input voltage of the front-end system and a preset voltage value.
According to another aspect of the present invention, a super farad capacitor charging and discharging control method is provided, including:
closing the first switch, charging the super farad capacitor through the front end system, and supplying power to the back end system;
collecting a voltage value of the super farad capacitor;
and when the voltage of the super farad capacitor is increased to a first voltage threshold value, closing a second switch, disconnecting the first switch and supplying power to the back-end system through the super farad capacitor.
Optionally, when the voltage of the super farad capacitor rises to the first voltage threshold, specifically:
collecting an input voltage value of the front-end system;
and when the voltage value of the super farad capacitor is equal to the input voltage value of the front-end system.
Optionally, the method further comprises:
and when the voltage of the super-farad capacitor is reduced to a second voltage threshold value, closing the first switch, disconnecting the second switch and supplying power to the back-end system through the front-end system.
Optionally, when the voltage of the super farad capacitor is reduced to a second voltage threshold, specifically:
and when the difference value between the voltage value of the super farad capacitor and the input voltage value of the front-end system is less than or equal to 5V.
Optionally, the method further comprises:
collecting an output voltage value of the back-end system;
and when the output voltage value of the back-end system is greater than the input voltage value of the front-end system, closing a second switch, disconnecting the first switch, and charging the super-farad capacitor through the back-end system.
According to a further aspect of the present invention, there is provided a terminal device, including the super farad capacitor charging and discharging control circuit.
The invention discloses a super farad capacitor charging and discharging control circuit, a method and electronic equipment, wherein the method comprises the following steps: closing the first switch, charging the super farad capacitor through the front end system, and supplying power to the back end system; collecting a voltage value of the super farad capacitor; when the voltage of the super farad capacitor rises to a first voltage threshold value, a second switch is closed, the first switch is disconnected, and power is supplied to the back-end system through the super farad capacitor; the control circuit of the super farad capacitor is formed by the logic gate circuit of the electronic comparator and used for switching a power supply path between the super capacitor and a main system power supply, so that the purpose of power supply isolation is achieved, the possibility of instantaneous high-current charging of the super farad capacitor is avoided, the system safety is improved, and the system endurance time is prolonged.
Drawings
Fig. 1 is a logic diagram of a super farad capacitor charging and discharging control method according to an embodiment of the present invention;
fig. 2 is a charging/discharging circuit diagram of a super farad capacitor according to an embodiment of the present invention;
fig. 3 is a flowchart of a super farad capacitor charging and discharging control method according to a second embodiment of the present invention;
fig. 4 is a flowchart of another super farad capacitor charging and discharging control method according to a second embodiment of the present invention;
fig. 5 is a flowchart of a charging/discharging control method for a super farad capacitor according to a second embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example one
As shown in fig. 1, in this embodiment, a super farad capacitor charge-discharge control circuit includes a first comparator, a second comparator, a first not gate, a second not gate, a first and gate, and a second and gate, where an input end of the first comparator collects an input voltage of a front-end system and an output voltage of a back-end system, an output end of the first comparator is connected to an input end of the first not gate, and an output end of the first not gate is connected to one input end of the first and gate and one input end of the second and gate; the input end of the second comparator is used for respectively collecting the voltage of the super-farad capacitor and a second voltage threshold, the output end of the second comparator is connected to the input end of the second NOT gate and the other input end of the first AND gate, and the output end of the second NOT gate is connected to the other input end of the second AND gate.
In this embodiment, the logic gate circuit of the electronic comparator forms a control circuit of the super farad capacitor, so as to switch a power path between the super capacitor and a main system power supply, thereby achieving the purpose of power isolation, avoiding the possibility of instantaneous heavy-current charging of the super farad capacitor, improving the system safety, and increasing the system endurance time.
As shown in fig. 2, in this embodiment, a first switch is disposed between the front-end system and the super farad capacitor, and a second switch is disposed between the back-end system and the super farad capacitor.
In this embodiment, the front-end system is a main power supply system, when the electronic device is powered on, the input voltage of the front-end system is Vi, the voltage supplies power to the super farad capacitor C and the back-end system through the first switch S1, the back-end system is a load system such as a motor, the output voltage of the back-end system is Vo, and the second switch S2 is disposed between the back-end system and the super farad capacitor. With the front-end system charging the super-farad capacitor through S1, gradually increasing the voltage Vsc of the super-farad capacitor, and when the voltage Vsc of the super-farad capacitor reaches a preset first voltage threshold, considering that the super-farad capacitor is charged; the second switch S2 is closed and the first switch S1 is opened and the back end system is powered by the super farad capacitor.
In this embodiment, the preset first voltage threshold may be an input voltage value of the front-end system, that is, when the voltage of the super farad capacitor is equal to the input voltage of the front-end system, it is considered that the charging of the super farad capacitor is completed.
As another example, the preset first voltage threshold may be any set value, such as 95% of the input voltage of the front-end system, and when the voltage of the super-farad capacitor is 95% of the input voltage of the front-end system, the charging of the super-farad capacitor is considered to be completed.
In the embodiment, after the back-end system is powered by the super farad capacitor, the voltage Vsc of the super farad capacitor is gradually decreased, and in the prior art, when the voltage value of the super farad capacitor is low, the input voltage of the front-end system is pulled down due to the instantaneous charging of the super farad capacitor at the instant of system power-on, which may cause system abnormality; therefore, in this embodiment, a voltage difference Δ V, for example, 5V, is set, when the difference between the voltage value of the super-farad capacitor and the input voltage of the front-end system is within this range, the back-end system is powered by the super-farad capacitor, and when the voltage difference is greater than the predetermined value, the main power source returns to the charging state for the super-farad capacitor.
In this embodiment, the difference between the voltage difference and the input voltage of the front-end system is the second voltage threshold (Vi- Δ v), which is used for comparing with the voltage value of the super farad capacitor to control the switching of the switches S1 and S2.
In this embodiment, when the back-end system generates a self-generating effect, such as passive rotation and sudden stop of the motor, the generated voltage charges the super farad capacitor through S2, and the super farad capacitor can absorb the back electromotive force generated by the motor, thereby protecting the front-end system from overvoltage impact.
In this embodiment, fig. 2 is a charging and discharging circuit diagram of a super-farad capacitor, and the isolation of the power supply is realized by switching the switches S1 and S2 in fig. 2; fig. 1 is a logic diagram of charge and discharge control of the super-farad capacitor, and the switches S1 and S2 are controlled by logic elements in the logic diagram.
In this embodiment, the output end of the first comparator, the output end of the first and gate, and the output end of the second and gate are used for controlling the first switch and the second switch.
As shown in fig. 1, when the output voltage Vo of the back-end system is greater than the input voltage Vi of the front-end system, the second switch S2 is closed, the first switch S1 is opened, and the generated voltage charges the super-farad capacitor through S2, so that the super-farad capacitor can absorb the back electromotive force generated by the motor, thereby protecting the front-end system from overvoltage impact.
On the contrary, when the output voltage Vo of the back-end system is less than or equal to the input voltage Vi of the front-end system, and when the voltage Vsc of the super farad capacitor is greater than the second voltage threshold, that is, the difference between the voltage of the super farad capacitor and the input voltage of the front-end system is less than the preset voltage difference, for example, 5V, the first and gate outputs a positive value, the second switch S2 is closed, the first switch S1 is opened, the power is supplied to the back-end system through the super farad capacitor, and at this time, the front-end system is isolated.
When the output voltage Vo of the back-end system is less than or equal to the input voltage Vi of the front-end system, and when the voltage Vsc of the super-farad capacitor is less than or equal to the second voltage threshold, that is, the difference between the voltage of the super-farad capacitor and the input voltage of the front-end system is greater than or equal to a preset voltage difference, for example, 5V, the second AND gate outputs a positive value, the first switch S1 is closed, the second switch S2 is opened, the super-farad capacitor is charged through the main power supply, that is, the front-end system, and the main power supply is used for supplying power to the back-end system.
Example two
As shown in fig. 3, in this embodiment, a method for controlling charging and discharging of a super farad capacitor includes:
s10, closing the first switch, charging the super farad capacitor through the front end system, and supplying power to the back end system;
s20, collecting the voltage value of the super farad capacitor;
and S30, when the voltage of the super-farad capacitor rises to a first voltage threshold value, closing a second switch, opening the first switch, and supplying power to the back-end system through the super-farad capacitor.
In this embodiment, the logic gate circuit of the electronic comparator forms a control circuit of the super farad capacitor, so as to switch a power path between the super capacitor and a main system power supply, thereby achieving the purpose of power isolation, avoiding the possibility of instantaneous heavy-current charging of the super farad capacitor, improving the system safety, and increasing the system endurance time.
In this embodiment, the front-end system is a main power supply system, when the electronic device is powered on, the input voltage of the front-end system is Vi, the voltage supplies power to the super farad capacitor C and the back-end system through the first switch S1, the back-end system is a load system such as a motor, the output voltage of the back-end system is Vo, and the second switch S2 is disposed between the back-end system and the super farad capacitor. With the front-end system charging the super-farad capacitor through S1, gradually increasing the voltage Vsc of the super-farad capacitor, and when the voltage Vsc of the super-farad capacitor reaches a preset first voltage threshold, considering that the super-farad capacitor is charged; the second switch S2 is closed and the first switch S1 is opened and the back end system is powered by the super farad capacitor.
In this embodiment, when the voltage of the super farad capacitor rises to the first voltage threshold, the following is specifically performed:
collecting an input voltage value of the front-end system;
and when the voltage value of the super farad capacitor is equal to the input voltage value of the front-end system.
In this embodiment, the preset first voltage threshold may be an input voltage value of the front-end system, that is, when the voltage of the super farad capacitor is equal to the input voltage of the front-end system, it is considered that the charging of the super farad capacitor is completed.
As another example, the preset first voltage threshold may be any set value, such as 95% of the input voltage of the front-end system, and when the voltage of the super-farad capacitor is 95% of the input voltage of the front-end system, the charging of the super-farad capacitor is considered to be completed.
As shown in fig. 4, in the present embodiment, step S30 is followed by:
and S40, when the voltage of the super-farad capacitor is reduced to a second voltage threshold value, closing the first switch, opening the second switch, and supplying power to the back-end system through the front-end system.
In the embodiment, after the back-end system is powered by the super farad capacitor, the voltage Vsc of the super farad capacitor is gradually decreased, and in the prior art, when the voltage value of the super farad capacitor is low, the input voltage of the front-end system is pulled down due to the instantaneous charging of the super farad capacitor at the instant of system power-on, which may cause system abnormality; therefore, in this embodiment, a voltage difference Δ V, for example, 5V, is set, when the difference between the voltage value of the super-farad capacitor and the input voltage of the front-end system is within this range, the back-end system is powered by the super-farad capacitor, and when the voltage difference is greater than the predetermined value, the main power source returns to the charging state for the super-farad capacitor.
In this embodiment, the difference between the voltage difference and the input voltage of the front-end system is the second voltage threshold (Vi- Δ v), which is used for comparing with the voltage value of the super farad capacitor to control the switching of the switches S1 and S2.
In this embodiment, when the voltage of the super farad capacitor is decreased to the second voltage threshold, the step is specifically:
and when the difference value between the voltage value of the super farad capacitor and the input voltage value of the front-end system is less than or equal to 5V.
As shown in fig. 5, in the present embodiment, step S30 is followed by:
collecting an output voltage value of the back-end system;
and S50, when the output voltage value of the back-end system is larger than the input voltage value of the front-end system, closing a second switch, disconnecting the first switch, and charging the super-farad capacitor through the back-end system.
In this embodiment, when the back-end system generates a self-generating effect, such as passive rotation and sudden stop of the motor, the generated voltage charges the super farad capacitor through S2, and the super farad capacitor can absorb the back electromotive force generated by the motor, thereby protecting the front-end system from overvoltage impact.
In this embodiment, fig. 2 is a charging and discharging circuit diagram of a super-farad capacitor, and the isolation of the power supply is realized by switching the switches S1 and S2 in fig. 2; fig. 1 is a logic diagram of charge and discharge control of the super-farad capacitor, and the switches S1 and S2 are controlled by logic elements in the logic diagram.
EXAMPLE III
In this embodiment, a terminal device includes the super farad capacitor charging and discharging control circuit described in the first embodiment, and is suitable for the super farad capacitor charging and discharging control method described in the second embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, and are not to be construed as limiting the scope of the invention. Any modifications, equivalents and improvements which may occur to those skilled in the art without departing from the scope and spirit of the present invention are intended to be within the scope of the claims.
Claims (8)
1. A super farad capacitor charge-discharge control circuit is characterized by comprising a first comparator, a second comparator, a first NOT gate, a second NOT gate, a first AND gate and a second AND gate, wherein the input end of the first comparator is used for collecting input voltage of a front end system and output voltage of a back end system respectively, the output end of the first comparator is connected with the input end of the first NOT gate, and the output end of the first NOT gate is connected to one input end of the first AND gate and one input end of the second AND gate; the input end of the second comparator is used for respectively acquiring the voltage of the super-farad capacitor and a second voltage threshold, the output end of the second comparator is connected to the input end of the second NOT gate and the other input end of the first AND gate, and the output end of the second NOT gate is connected to the other input end of the second AND gate;
a first switch is arranged between the front-end system and the super farad capacitor, and a second switch is arranged between the rear-end system and the super farad capacitor;
the output end of the first comparator, the output end of the first AND gate and the output end of the second AND gate are used for controlling the first switch and the second switch.
2. The super farad capacitor charge-discharge control circuit according to claim 1, wherein the second voltage threshold is a difference between an input voltage of the front-end system and a preset voltage value.
3. A super farad capacitor charging and discharging control method, which is suitable for the super farad capacitor charging and discharging control circuit of any one of claims 1-2, and is characterized by comprising the following steps:
closing the first switch, charging the super farad capacitor through the front end system, and supplying power to the back end system;
collecting a voltage value of the super farad capacitor;
and when the voltage of the super farad capacitor is increased to a first voltage threshold value, closing a second switch, disconnecting the first switch and supplying power to the back-end system through the super farad capacitor.
4. The charging and discharging control method for the super-farad capacitor according to claim 3, wherein when the voltage of the super-farad capacitor rises to a first voltage threshold, the method specifically comprises:
collecting an input voltage value of the front-end system;
and when the voltage value of the super farad capacitor is equal to the input voltage value of the front-end system.
5. The super farad capacitor charge-discharge control method according to claim 4, further comprising:
and when the voltage of the super-farad capacitor is reduced to a second voltage threshold value, closing the first switch, disconnecting the second switch and supplying power to the back-end system through the front-end system.
6. The charging and discharging control method for the super-farad capacitor according to claim 5, wherein when the voltage of the super-farad capacitor is reduced to a second voltage threshold, the method specifically comprises:
and when the difference value between the voltage value of the super farad capacitor and the input voltage value of the front-end system is less than or equal to 5V.
7. The super farad capacitor charge-discharge control method according to claim 3, further comprising:
collecting an output voltage value of the back-end system;
and when the output voltage value of the back-end system is greater than the input voltage value of the front-end system, closing a second switch, disconnecting the first switch, and charging the super-farad capacitor through the back-end system.
8. An electronic device comprising the super farad capacitor charge and discharge control circuit of any one of claims 1-2.
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| CN201911340855.8A CN110932377B (en) | 2019-12-23 | 2019-12-23 | Super farad capacitor charging and discharging control circuit and method and electronic equipment |
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| JP5937050B2 (en) * | 2013-10-25 | 2016-06-22 | 横河電機株式会社 | Charging circuit |
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| CN1667911A (en) * | 2004-02-13 | 2005-09-14 | 精工电子有限公司 | Charging and discharging control circuit, and charging type power supply device |
| CN204928197U (en) * | 2015-05-14 | 2015-12-30 | 中国第一汽车股份有限公司 | Be applied to to open and stop compound power of systematic two voltage ultracapacitor system |
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Address after: 518000 Room 401, block D, building 7, Shenzhen International Innovation Valley, Dashi 1st Road, Xili community, Xili street, Nanshan District, Shenzhen, Guangdong Patentee after: JUXING TECHNOLOGY (SHENZHEN) Co.,Ltd. Address before: 518000 building 101, building R3b, Gaoxin industrial village, No.018, Gaoxin South 7th Road, community, high tech Zone, Yuehai street, Nanshan District, Shenzhen City, Guangdong Province Patentee before: JUXING TECHNOLOGY (SHENZHEN) Co.,Ltd. |